package DP;

import java.util.Scanner;

public class ClimbStairs {
    public static int climbStairs(int n) {
        int dp[] = new int[n+1];
        dp[0] = 1;
        dp[1] = 1;
        for (int i = 2; i <= n; i++) {
            dp[i] = dp[i - 1] + dp[i - 2];
        }
        return dp[n];
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入楼梯总数：");
        int n = sc.nextInt();
        System.out.println(climbStairs(n));
    }
}
